325/40 R21 Summer Tires – Used

The 325/40 R21 size is one of the extremely wide high-performance tire sizes , which is mainly used on large luxury SUVs , powerful performance SUVs , AMG/M/RS models and electric high-performance vehicles .
With a massive 325 mm tread and a stable 40 mm cross-section, this dimension offers:

• maximum traction

• exceptional lateral stability

• short braking distances despite vehicle mass

• High directional stability at motorway speeds

• optimal power transmission at high torque

Vehicles that use 325/40 R21 tires almost always have:

• very high axle loads

• large brake systems

• Sport or air suspension systems

• All-wheel drive systems (xDrive, Quattro, 4Matic)

• electric high-performance drives with instant torque

Used tires in this category require more intensive inspection, as even small structural defects can be safety-critical under these loads.

✔ Vehicle types that commonly use 325/40 R21

Large performance SUVs

• BMW X7 (M Sport / M50i)

• Mercedes GLS (AMG Line, GLS 580, GLS 63)

• Audi SQ7 / SQ8 (models with wide rear axle design)

Luxury SUVs & Top-of-the-range models

• Range Rover (high-spec variants)

• Bentley Bentayga (variants)

Electric SUVs & EV Performance Vehicles

• BMW iX (wide tire options)

• Mercedes EQS SUV

• Audi e-tron / Q8 e-tron Performance

All-wheel drive vehicles (AWD/4x4)

• extremely sensitive to differences in tread depth

• require identical rolling circumference (front/rear matched)

🔧 Technical test criteria for used 325/40 R21 summer tires

1. Tread depth & wear analysis

The following will be checked:

• sufficient remaining tread depth

• Even wear despite high vehicle loads

• no block cracks or signs of overheating

2. DOT analysis & material evaluation

Important due to thermal stresses:

• Year of manufacture

• Material hardness & elasticity

• UV and heat aging

3. Carcass & Structure Inspection

This dimension is absolutely crucial:

• no cuts, tears, or dents

• no carcass or belt fractures

• Reinforced side walls must be completely intact.

4. Runout & Vibration Test

Relevant for:

• Smooth running at high speeds

• Stability of large SUVs

• Avoiding imbalances with large rim diameters

5. Load Capacity & Speed ​​Index (LI/SI)

Especially important for:

• heavy SUVs

• Electric vehicles with battery mass

• High-performance models with high continuous load

6. Air tightness test

Each tire is checked for constant pressure loss.

🛠 Tyre44 testing procedure for used 325/40 R21 summer tires

All tires are checked for:

• digital tread depth measurement

• DOT analysis & material evaluation

• Carcass and structural integrity

• Runout and vibration measurement

• Airtightness

• OEM-compliant rolling circumference values

→ Only tires in absolutely perfect technical condition are included in the Tyre44 product range.

🧊 Summer tire offer in 325/40 R21 (used) at Tyre44

We offer:

• tested used high-load summer tires

• DOT and tread depth variants as required

• XL/reinforced models for extreme load capacity

• Performance-optimized summer profiles

• affordable alternatives to new tires

🔍 Easily select suitable used summer tires

With the Tyre44 vehicle filter
(Manufacturer → Model series → Model name)
You will receive tires that:

• fully compatible with 325/40 R21

• Load capacity and speed indices are met

• Adhere exactly to OEM rolling circumference

• Ideally suited for large SUVs, luxury models, EVs & AWD vehicles

→ No more bad purchases.

⭐ Why Tyre44?

• Strictly inspected used summer tires in size 325/40 R21

• documented DOT and tread depth information

• fast delivery throughout Europe

• Premium quality at an attractive price

• Maximum stability, safety & performance

Order your tested used summer tires in size 325/40 R21 now – extremely durable, wide & performance-oriented! 🚀